/* * Copyright (C) 2003-2015 The Music Player Daemon Project * http://www.musicpd.org * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "config.h" #include "Resolver.hxx" #include "SocketAddress.hxx" #include "util/Error.hxx" #include "util/Domain.hxx" #include #ifndef WIN32 #include #include #ifdef HAVE_TCP #include #endif #else #include #include #endif #ifdef HAVE_UN #include #endif #include #include const Domain resolver_domain("resolver"); #ifdef HAVE_UN static std::string LocalAddressToString(const struct sockaddr_un &s_un, size_t size) { const size_t prefix_size = (size_t) ((struct sockaddr_un *)nullptr)->sun_path; assert(size >= prefix_size); size_t result_length = size - prefix_size; /* remove the trailing null terminator */ if (result_length > 0 && s_un.sun_path[result_length - 1] == 0) --result_length; if (result_length == 0) return "local"; std::string result(s_un.sun_path, result_length); /* replace all null bytes with '@'; this also handles abstract addresses (Linux specific) */ std::replace(result.begin(), result.end(), '\0', '@'); return result; } #endif std::string sockaddr_to_string(SocketAddress address) { #ifdef HAVE_UN if (address.GetFamily() == AF_UNIX) /* return path of UNIX domain sockets */ return LocalAddressToString(*(const sockaddr_un *)address.GetAddress(), address.GetSize()); #endif #if defined(HAVE_IPV6) && defined(IN6_IS_ADDR_V4MAPPED) const struct sockaddr_in6 *a6 = (const struct sockaddr_in6 *) address.GetAddress(); struct sockaddr_in a4; #endif int ret; char host[NI_MAXHOST], serv[NI_MAXSERV]; #if defined(HAVE_IPV6) && defined(IN6_IS_ADDR_V4MAPPED) if (address.GetFamily() == AF_INET6 && IN6_IS_ADDR_V4MAPPED(&a6->sin6_addr)) { /* convert "::ffff:127.0.0.1" to "127.0.0.1" */ memset(&a4, 0, sizeof(a4)); a4.sin_family = AF_INET; memcpy(&a4.sin_addr, ((const char *)&a6->sin6_addr) + 12, sizeof(a4.sin_addr)); a4.sin_port = a6->sin6_port; address = { (const struct sockaddr *)&a4, sizeof(a4) }; } #endif ret = getnameinfo(address.GetAddress(), address.GetSize(), host, sizeof(host), serv, sizeof(serv), NI_NUMERICHOST|NI_NUMERICSERV); if (ret != 0) return "unknown"; #ifdef HAVE_IPV6 if (strchr(host, ':') != nullptr) { std::string result("["); result.append(host); result.append("]:"); result.append(serv); return result; } #endif std::string result(host); result.push_back(':'); result.append(serv); return result; } struct addrinfo * resolve_host_port(const char *host_port, unsigned default_port, int flags, int socktype, Error &error) { std::string p(host_port); const char *host = p.c_str(), *port = nullptr; if (host_port[0] == '[') { /* IPv6 needs enclosing square braces, to differentiate between IP colons and the port separator */ size_t q = p.find(']', 1); if (q != p.npos && p[q + 1] == ':' && p[q + 2] != 0) { p[q] = 0; port = host + q + 2; ++host; } } if (port == nullptr) { /* port is after the colon, but only if it's the only colon (don't split IPv6 addresses) */ auto q = p.find(':'); if (q != p.npos && p[q + 1] != 0 && p.find(':', q + 1) == p.npos) { p[q] = 0; port = host + q + 1; } } char buffer[32]; if (port == nullptr && default_port != 0) { snprintf(buffer, sizeof(buffer), "%u", default_port); port = buffer; } if ((flags & AI_PASSIVE) != 0 && strcmp(host, "*") == 0) host = nullptr; addrinfo hints; memset(&hints, 0, sizeof(hints)); hints.ai_flags = flags; hints.ai_family = AF_UNSPEC; hints.ai_socktype = socktype; struct addrinfo *ai; int ret = getaddrinfo(host, port, &hints, &ai); if (ret != 0) { error.Format(resolver_domain, ret, "Failed to look up '%s': %s", host_port, gai_strerror(ret)); return nullptr; } return ai; }